Hurricane 15L

Passive Microwave (PMW) Intensity Information
Advanced Dvorak Technique
Version 9.1


       --Overpass--              --ARCHER--   Ring  Ring            Eye              BT   -Forecast-  
       Date    Time      Sat     Lat    Lon   Diam   Pct  TbDiff   Score  Meaning   Vmax  Lat    Lon                 
     20230915 165000     AMSR2   15.4  -44.0   N/A   N/A     N/A     N/A      N/A   30.0  14.8  -44.1 Analysis Plot     
     20230915 200944       GMI   15.7  -44.2   123    1%    4.32   -4.32      N/A   30.0  15.0  -44.3 Analysis Plot     
     20230915 204202  SSMISF17   15.4  -43.4   N/A   N/A     N/A     N/A      N/A   30.0  15.6  -44.1 Analysis Plot     
     20230916 050148     AMSR2   17.2  -44.8   N/A   N/A     N/A     N/A      N/A   30.0  17.0  -45.2 Analysis Plot     
     20230916 073348  SSMISF18   18.1  -45.0    23   N/A    0.95   -0.95      N/A   30.0  17.9  -45.3 Analysis Plot     
     20230916 091545  SSMISF17   18.2  -45.3   212    3%    1.59   -1.59      N/A   30.0  18.2  -45.5 Analysis Plot     
     20230916 155626     AMSR2   19.6  -46.0   N/A   N/A     N/A     N/A      N/A   30.0  20.1  -46.5 Analysis Plot     
     20230916 184645  SSMISF18   20.4  -46.5    90   17%    1.39   -1.39      N/A   30.0  20.5  -46.7 Analysis Plot     
     20230916 184649  SSMISF18   20.7  -46.5   N/A   N/A     N/A     N/A      N/A   30.0  20.7  -46.9 Analysis Plot     
     20230916 203935  SSMISF16   20.5  -48.7   N/A   N/A     N/A     N/A      N/A   30.0  20.8  -47.1 Analysis Plot     
     20230917 071844  SSMISF18   22.8  -48.5   135   12%    3.56   -3.56      N/A   45.0  23.0  -48.7 Analysis Plot     
     20230917 091109  SSMISF16   23.3  -48.2   223   N/A    2.48   -2.48      N/A   45.0  23.3  -48.8 Analysis Plot     
     20230917 163906     AMSR2   24.7  -49.0    12   99%    8.16  -23.16      N/A   50.0  24.4  -49.4 Analysis Plot     
     20230917 183516  SSMISF18   24.5  -49.7   N/A   N/A     N/A     N/A      N/A   50.0  24.6  -49.5 Analysis Plot     
     20230917 183526  SSMISF18   24.5  -49.7    79   26%    0.90    0.90      N/A   55.0  24.8  -49.7 Analysis Plot     
     20230917 202726  SSMISF16   24.9  -49.4    79   10%    5.18    5.18      N/A   55.0  25.1  -49.5 Analysis Plot     
     20230918 044732     AMSR2   26.2  -50.5   179   33%    7.63    7.63      N/A   60.0  26.3  -50.6 Analysis Plot     
     20230918 070538  SSMISF18   26.0  -50.8    46   12%    5.26    5.26      N/A   65.0  26.5  -50.8 Analysis Plot     
     20230918 091613       GMI   26.3  -51.0   N/A   N/A     N/A     N/A      N/A   65.0  26.5  -50.7 Analysis Plot     
     20230918 091626       GMI   26.6  -50.7   N/A   N/A     N/A     N/A      N/A   70.0  26.6  -50.8 Analysis Plot     
     20230918 102716  SSMISF17   26.4  -50.7   N/A   N/A     N/A     N/A      N/A   70.0  26.9  -51.0 Analysis Plot     
     20230918 190150       GMI   27.7  -51.8   N/A   N/A     N/A     N/A      N/A   70.0  27.7  -51.8 Analysis Plot     
     20230918 201559  SSMISF16   27.8  -52.0    57   26%    9.81    9.81      N/A   70.0  27.9  -52.0 Analysis Plot     
     20230918 214501  SSMISF17   28.0  -52.1   N/A   N/A     N/A     N/A      N/A   70.0  28.1  -52.3 Analysis Plot     
     20230918 214508  SSMISF17   27.9  -52.0    57   11%    7.94    7.94      N/A   70.0  28.3  -52.5 Analysis Plot     
     20230919 052907     AMSR2   29.0  -53.1   135   19%    1.93    1.93      N/A   75.0  29.2  -53.2 Analysis Plot     
     20230919 101228  SSMISF17   29.5  -53.8   123   29%   24.55   24.55  >65 kts   75.0  30.1  -53.9 Analysis Plot     
     20230919 162915     AMSR2   30.8  -54.4   101  100%   45.12   60.12  >85 kts   80.0  30.9  -54.5 Analysis Plot     
     20230919 213236  SSMISF17   32.1  -54.9    90  100%   36.98   51.98  >65 kts   85.0  32.3  -54.7 Analysis Plot     
     20230920 090648       GMI   34.5  -54.8   101   17%    7.96    7.96      N/A   85.0  34.5  -54.8 Analysis Plot     
     20230920 095804  SSMISF17   34.6  -54.9   101   15%    7.39    7.39      N/A   85.0  35.0  -54.6 Analysis Plot     
     20230920 101017  SSMISF16   34.7  -54.7    90   19%    7.43    7.43      N/A   85.0  35.1  -54.5 Analysis Plot     
     20230920 171402     AMSR2   36.6  -53.7    57    1%    2.11    2.11      N/A   80.0  36.8  -54.0 Analysis Plot     
     20230920 212019  SSMISF17   37.6  -52.7    79    1%    2.06    2.06      N/A   80.0  37.5  -52.9 Analysis Plot     
     20230921 051346     AMSR2   39.2  -49.6   N/A   N/A     N/A     N/A      N/A   80.0  40.0  -48.6 Analysis Plot     
     20230921 081448       GMI   40.1  -48.5   N/A   N/A     N/A     N/A      N/A   75.0  40.3  -48.2 Analysis Plot     
     20230921 094201  SSMISF17   40.5  -47.9   101   N/A    4.76    4.76      N/A   75.0  41.1  -46.5 Analysis Plot     
     20230921 161934     AMSR2   42.4  -43.8    90   N/A    7.79    7.79      N/A   75.0  42.8  -44.0 Analysis Plot     
     20230921 174730  SSMISF18   42.9  -43.2    79   N/A    5.77    5.77      N/A   75.0  43.0  -43.4 Analysis Plot     
     20230921 210846  SSMISF17   43.4  -40.3   101   N/A    4.41    4.41      N/A   70.0  43.8  -40.5 Analysis Plot     
     20230922 041635     AMSR2   44.9  -34.6   N/A   N/A     N/A     N/A      N/A   65.0  46.0  -34.8 Analysis Plot

Legend

  - Overpass Date/Time are determined from satellite overpass of targeted TC (position determined from Best Track Lat/Lon position). Date is YYYYMMDD and time in HHMMSS (UTC).

  - Forecast (Best Track) and ARCHER positions (deg) of the TC center at overpass day/time. Positive/Negative: Latitude = North/South Hemisphere; Longitude = Eastern/Western Hemisphere.

  - BT Vmax is the concurrent ATCF Best Track (BT) wind speed intensity estimate (Vmax) value from either NOAA/National Hurricane Center (NHC) (North Atlantic and Northeast Pacific), NOAA/Central Pacific Hurricane Center (CPHC) (North-central Pacific) or Joint Typhoon Warning Center (JTWC) (Northwest Pacific, Indian Ocean, or Southwest Pacific).

  - Sat is the satellite descriptor providing the overpass. Currently the satellites used are the DMSP/SSMIS-16/17/18, GPM/GMI, and GCOM/AMSR2.

  - Ring Diam (km) indicates the estimated surface eyewall diameter if one is analyzed in the PMW imagery. The value listed is the average PMW-estimated inner eyewall edge diameter minus 10 km for eyewall slope. N/A indicates no appreciable eyewall is analyzed.

  - Ring Pct is the percentage of the analyzed "ring" (eyewall inner boundary) that is 1) colder than the eye Tb (the "hot spot" -- warmest eye pixel) by at least 20K, or 2) that is colder than 232K and colder than the eye Tb by 10K, whichever is greater. Values are red if Ring % ≤65,yellow/brown if Ring % ≤85 and green if Ring % >85. N/A indicates no appreciable eyewall is analyzed. A value over 85% is used in the intensity score by adding 15 points to it.

  - TbDiff is the difference between the warmest eye pixel and the warmest pixel on the eyewall. This value is used in the Intensity Score. N/A indicates no appreciable eyewall is analyzed.

  - Eye Score values are based on the strength and organization of the convective/eyewall signatures in the PMW imagery, and based on the ARCHER center location. They normally range from 0 to 100 with empirically-determined thresholds related to intensity (Vmax) in the "Meaning" column (≥20 suggests ≥65kts; ≥60 suggests ≥85kts). Scores are listed as negative, and not used by the ADT, when the NHC, CPHC, or JTWC Best Track Vmax is <55 kts in order to filter out occasional "false eye" cases. A value of -920 is used when the warmest eye pixel is <200K to prevent false positives; -930 means edge of overpass and <85% of eyewall is captured and therefore can't fully be analyzed.